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gene for potato resistance to late blight (Phytophthora infestans) belongs to the leucine zipper/NBS/LRR class of plant resistance genes. The Plant Journal 30, 361–371. Gebhardt C. The R1 gene for potato resistance to late

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, L. T., Turkensteen, L. J., Prummel, W., Budding, D. J. and Hoogendoorn, J. (1995): Durable resistance to late blight (Phytophthora infestans) in old cultivars. European J. Plant. Path. 101, 387-397. Durable resistance to

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. and Bakonyi, J. (1997): Potato late blight: the disease and the pathogen. Növényvédelem 33 , 353-382. (In Hungarian with English summary.) Potato late blight: the disease and the pathogen

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late blight pathogen.-in: Impact on a changing world. Program report . International Potato Center, 1997–98, Lima, Peru, pp. 57–66. Forbes G.A. Impact

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Acta Agronomica Hungarica
Authors: R. Ahmadvand, A. Takács, J. Taller, I. Wolf and Z. Polgár

Potato (Solanum tuberosum L.) is the fourth most important food crop in the world. It is the most economically valuable and well-known member of the plant family Solanaceae. Potato is the host of many pathogens, including fungi, bacteria, Phytoplasmas, viruses, viroids and nematodes, which cause reductions in the quantity and quality of yield. Apart from the late blight fungus [Phytophthora infestans (Mont.) de Bary] viruses are the most important pathogens, with over 40 viruses and virus-like pathogens infecting cultivated potatoes in the field, among which Potato virus Y (PVY), Potato leaf roll virus (PLRV), Potato virus X (PVX), Potato virus A (PVA), Potato virus S (PVS) and Potato virus M (PVM) are some of the most important viruses in the world. In this review, their characteristics and types of resistance to them will be discussed.

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Cell walls of the phytopathogenic fungus, Botrytis cinerea were identified for the presence of biotic elicitors. The isolation of carbohydrates from purified mycelial cell walls of B. cinerea (CCW) and the effect of CCW on induction of disease resistance of Lycopersicon esculentum were carried out. CCW, Immunocytophyt and a fungicide, Ridomil Gold, were evaluated for the control of late blight, early blight and nailhead spot, the most damaging diseases of tomato in Ukraine. The results of 2-year greenhouse experiments and field trials demonstrated that foliar spraying of tomato plants with sensitizing concentration of CCW (0.01%) reduced development of infection during the vegetation period and crop losses. Our results indicate that the elicitoractive carbohydrates from cell walls of the fungal pathogen B. cinerea are effective to induce systemic resistance against tomato foliar diseases under greenhouse and field conditions.

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director general . Global Potato Conf. New Delhi. India. 1 – 5 . 189. Rani , A. – Bhatt , M. N. – Singh , B. P. – Singh , P. H. – Rana , D. K. : 2006 . Late blight scenario in

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The tomato spotted wilt disease caused by tospoviruses in tomato is an important viral disease. Artificial screening of tomato wild species and cultivars for resistance to tospoviruses revealed the wild species Lycopersicon peruvianum to be resistant to tospovirus infection. The protein profile in L. peruvianum showed additional proteins of molecular sizes of 45kDa, 34kDa and 26kDa and an additional 55kDa protein was detected in L. pimpinellifolium . The peroxidase isozyme pattern was also found to be distinct in L. peruvianum . cDNAs of R genes coding for tospovirus resistance were isolated from the wild species, L. peruvianum (TNAU T). The partial cDNAs were cloned in the vector pTZ57R/T, sequenced and characterized. The tomato varieties, hybrid and wild species L. pimpinellifolium selected in this study were susceptible to tospovirus infection and did not show presence of R genes. Sequence analysis of the partial cDNAs corresponding to the R genes isolated from the wild species L. peruvianum showed considerable homology on the protein level with already available resistance proteins like late blight resistance protein, root knot nematode resistance protein, potato disease resistance protein, Hero protein confirming resistance against potato cyst nematode, and Prf protein confirming resistance against Pseudomonas syringae pv. tomato . In the present study, R genes effective against tospoviruses were isolated and characterized from a wild species of tomato. These results have important impact in terms of transformation strategies to develop tospovirus resistant transgenic plants.

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spread of late blight, P. infestans (Mont.) Debary in sole and intercrop potato plots. Phytopathology , 72 , 258. Alcazar J. Development and spread of late blight, P. infestans

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Érsek, T. and Bakonyi, J. (1997): Potato late blight: the disease and the pathogen. Növényvédelem (Plant Protection) 33, 353-382. (In Hungarian, English summary) Potato late blight: the disease and the pathogen

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